Improvement in angle-plates



UNITED STATES PATENT OFFICE.

GEORGE K. RIX, OF CHICAGO, ILLINOIS, ASSIGNOR TO CLINTON WVIRE CLOTHCOMPANY, OF CLINTON, MASSACHUSETTS.

IMPROVEM ENT IN ANGLE-PLATES.

Specification forming part of Letters Patent No. 215,298.,dated May 13,1879 application filed June 10, 1878.

To all whom it may concern:

Be it known that I, Gnonen K. Rrx, of the city of Chicago and State ofIllinois, have invented a certain new and useful Improvement inAngle-Plates, of which thefollowing, taken together with theaccompanying drawings, is a full and accurate specification.

My invention relates to an angle-plate applicable to the interior orentering angles of frames; and consists in providing the angleplate withan extended rib adapted to enter coincident grooves in the oppositefaces of the parts to be joined when they are laid together in position,so that when the angle-plate is ap plied to the corner the rib lies inboth grooves, serving as a feather to retain the meeting ends in properrelation laterally, and as a rib to strengthen the angle-plate and thejoint.

Figure 1 is a perspective view of the ribbed plate, showing its relationto the frame-joint, the frame being indicated by dotted lines. Fig. 2 isa section of the frame and plate through the line 00 00, Fig. 1. Fig. 3is a perspective view of the improved an gle-plate detached.

A A are the limbs of an angle-plate, intended to lie in the enteringangle formed by the contiguous sides of the frame, as shown in Fig. 1. Bis the exterior triangular or tapering rib, having the extendedattachment along the median line of the limbs on both sides of theangle. The rib is of uniform thickness, and from the extreme points ofattachment is preferably narrowed toward its free outer extremity, whichlies in the line of the miter. Each limb of the angle-plate is shownextended beyond the rib, and provided with screw hole or holes .9. r

In applying my improved angle-plate to the miter-joint of a frame theends of the parts to be joined are first given the proper miter to form,when brought together, the angle required between said parts. Aninclined or beveled groove, S, of suitable dimensions to admit one-halfthe rib is then cut in each part, gaged from the same face of the stuff,so that the two will coincide when the meeting ends are broughttogether. The rib is inserted into the recess thus formed in one face ofthe corner when the mitered ends are brought together, and the plate isproperly secured by screws. It is plain that the faces of the joinedparts will be permanently held perfectly flush. For this purpose, andalso for the purpose of strengthening thejoint, the rib, acting also asa feather, serves every office of two external flanges, one on eitherside of the frame. The article is much cheaper than a double-flangedplate; is applicable where exterior flanges are impracticable; it bringsthe faces flush, as described, without care, and greatly facilitates theoperation of joining the frame, besides obviating the objectionableappearance and presence of exposed flanges or ribs when either or bothof the latter are for other reasons admissible.

The angle-plate described is more especially intended to be used uponwindow-screens, and as these often require to be dressed off in fittingthem to the windows, it will be desirable to make the rib or feather Bof such length as to lie Wholly Within the frame, as shown in Fig. 11,leaving ample space beyond the rib to allow any reasonable dressing ofthe wood that may be required.

While the main edges of the rib may be parallel, I prefer to direct themto form a tapering rib, as shown in Figs. 1 and 3, and to cut the kerfscorrespondingly inclined, so that little or none of the latter will bevisible on the outer face of the frame. The form of the feather-rib may,however, be varied to adapt the plate to be interiorly applied to otherforms of joint than the miter.

In a frame provided at all its angles with the ribbed angle-platedescribed no other fastening is required besides the screws indicated;but an individual joint may be further strengthened by rivets passingthrough the frame and rib.

The plate may have any breadth, and may be provided with any desirednumber of parallel feather-ribs, adapting the plates to joints of anyextent-as, for example, the corners of trunks and boxes.

My invention purposely contemplates but one angle-plate in connectionwith the feather, so that it can be applied not only while bringing theparts of the frame together, but also, and

better, after they are brought together. This construction, moreover,does not require that the wood be out across from one plate to anotheror clear across the frame-stuff, thereby weakening it and rendering itliable to split. As illustrated by Fig. 1, on the other hand the woodmay, as already stated, be undisturbed on the outer face of the frame,and remains both to strengthen the frame and to conceal the feather, asset forth.

Having thus described my invention, I claim and desire to secure byLetters Patent- 1. A single angle-plate provided with a central rib orfeather on its exterior angle or face, adapted to enter a recess formedby beveled grooves cut in the several meeting parts of a frame afterthey have been brought together, substantially as described.

2. A corner-joint formed of the meeting faces of the parts joined,opposite grooves in said meeting faces, and a single interior angleplate having a rib-feather that lies concealed in the oppositegrooves, substantially as described, aud for the purposes set forth.

JEssE 00X, Jr., M. E. DAYTON.

